perf/arm: Remove driver-specific throttle support

The throttle support has been added in the generic code. Remove
the driver-specific throttle support.

Besides the throttle, perf_event_overflow may return true because of
event_limit. It already does an inatomic event disable. The pmu->stop
is not required either.

Signed-off-by: Kan Liang <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Tested-by: Leo Yan <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

Author: Kan Liang

drivers/perf/arm_pmuv3.c

@@ -887,8 +887,7 @@ static irqreturn_t armv8pmu_handle_irq(struct arm_pmu *cpu_pmu)
 		 * an irq_work which will be taken care of in the handling of
 		 * IPI_IRQ_WORK.
 		 */
-		if (perf_event_overflow(event, &data, regs))
-			cpu_pmu->disable(event);
+		perf_event_overflow(event, &data, regs);
 	}
 	armv8pmu_start(cpu_pmu);
 

drivers/perf/arm_v6_pmu.c

@@ -276,8 +276,7 @@ armv6pmu_handle_irq(struct arm_pmu *cpu_pmu)
 		if (!armpmu_event_set_period(event))
 			continue;
 
-		if (perf_event_overflow(event, &data, regs))
-			cpu_pmu->disable(event);
+		perf_event_overflow(event, &data, regs);
 	}
 
 	/*

drivers/perf/arm_v7_pmu.c

@@ -930,8 +930,7 @@ static irqreturn_t armv7pmu_handle_irq(struct arm_pmu *cpu_pmu)
 		if (!armpmu_event_set_period(event))
 			continue;
 
-		if (perf_event_overflow(event, &data, regs))
-			cpu_pmu->disable(event);
+		perf_event_overflow(event, &data, regs);
 	}
 
 	/*

drivers/perf/arm_xscale_pmu.c

@@ -186,8 +186,7 @@ xscale1pmu_handle_irq(struct arm_pmu *cpu_pmu)
 		if (!armpmu_event_set_period(event))
 			continue;
 
-		if (perf_event_overflow(event, &data, regs))
-			cpu_pmu->disable(event);
+		perf_event_overflow(event, &data, regs);
 	}
 
 	irq_work_run();
@@ -519,8 +518,7 @@ xscale2pmu_handle_irq(struct arm_pmu *cpu_pmu)
 		if (!armpmu_event_set_period(event))
 			continue;
 
-		if (perf_event_overflow(event, &data, regs))
-			cpu_pmu->disable(event);
+		perf_event_overflow(event, &data, regs);
 	}
 
 	irq_work_run();